Centrifugal vacuum pump



Se t. 4; 1928.

E. M. R. WEINER ET AL CENTRIFUGAL VACUUM PUMP Filed Aug. 21, 1924 sSheets-Sheet 1 I INVENTO/ J Edwin miawemer Floyd /'t' 00d; g I zgf zgSept. 4, .1928.

1,682,945 E. M. R. WEINER ET Al. CENTRIFUGAL VACUUM PUMP Fil ed Aug. 21,1924 s SheetsSheet 2 [NV/ENTQR Edwin m. 7?. Werner A TTORNE rs Sept. 4,1928.-

E. M. R. WEINER ET AL 4 CENTRIFUGAL VACUUM PUMP Filed Aug. 21, 1924 3Sheets-Sheet 3 Patented Sept. 4-, 1928.

UNITED stares eater FFECE.

EDWIN M. R. WEINER, ()1? TH 111E RIVERS, AND FLOYD F. WOODS, 0F BATTLEGREEK, MICHIGAN.

CENTR-IFUGAL VAGUUM PUMP.

Application filed August 21, 1924.

This invention relates to improvements in centrifugal vacuum pumps. 1

The main objects of this invention are:

First, to provide an improved vacuum pump of the centrifugal type which.is of high efficiency.

Mecond, to provide unimproved pump of this type which is well balanced.

Third, to provide an improved pump having these advantages which issimple and economical in structure and durable use.

Objects pertain ng to details and econo inies of construction and.operation of our invention will definitely appear from the detaileddescription to follow.

We accomplish the objects of our invention by the devices and meansdescribed in the following specification. The invention is clearlydefined and pointed out in the claims.

A structure embodying the "features of our invention is clearly shown inthe accompanying drawing forming a part of this application, in which:

Fig/I is a side elevation of a. structure embodying the features of ourinvention.

Fig. II is a detail view, mainly in section, on. a line corresponding tothe broken line 2-2 of Fig. I.

Fig. III is a side view of one of the impeller entraining or shroudplates of the embodiment of our invention shown in Fig. II.

Fig. IV is a detail view mainly in section of a modified form of ourinvention as modified for a single suction pump.

Fig. V is a side view of one'of the imieller plates employed in theembodiment shown in Fig. IV.

Fig. VI is a fragmentary section showing our improvements as embodied ina double suction structure in which the impeller shroud or entrainingplates are secured to the impeller.

Fig. VII is a side view of one of the entraining or shroud plates of thestructure shown in Fig. VI.

Fig. VIII is a fragmentary sect on of a single suction pump in which theentraining or impeller shroud plates are secured to the impeller torotate therewith.

In the drawing similar numerals of ref- Serial No. 7523, 215.

erence indicate similar parts throughout the several views.

Referring to the drawing, the pump illustrated in Figs. I and II is ofthe volute type, the casing being designated generally by the numeral 1and having the usual volute discharge passage 2. The impeller shaft .3

is supported in bearings at carried by bearing brackets projecting fromthe sides of the casing. I

The impeller 5 has a plurality of radial blades 6. The embodiment shownin Figs. I and II is of the double suct on type, there being a suctioninlet 7 at eachside opening into the hub of the impeller. At each sideof the impeller blades is an impeller shroud or entraining plate 8, theplates being mounted. in the casing so as to provide annular airchambers 9 connected through the ports 10 with the inlet chamber orheader 11.

The entraining plates 8 have a plurality of segmental slots 12 disposedconcentrically relative to the axis of the impeller and in overlappingrelation as clearly shown in Fig. III. These slots taper inwardly asshown in Fig. II.

These impeller shroud plates or entraining plates are disposed withtheir inner sides in close proximity to the blades of the impeller sothat as the water is driven past the slots an ejector effect secured andthe V we illustrate our invention as embodied in a single suction pump,the casing 13 having a single inlet 14c and the impeller 15 beingsupported at one end only. In this structure the entraining plate 16 isflat while the plate 17 is curved, the plates corresponding to the edgesof the blades. The slots 18 of this embodiment are disposed at an angleto the radial planes of the entraining plates so that in use the wateris discharged substantially at right angles across the slots. The slotsare tapered as in the embodiment de scribed.

In the embodiment shown in Figs. VI and VII the casing 19 is of thedouble suction type and the entraining plates or impeller shroudplatesare secured tothe impeller blades 21 to rotate therewith. In thisembodiment the slots 22 are continuous eccentric slots, the plates beingsupported by the imp eller blades as indicated by dotted lines in ig.VII.v

In Fig. VIII we show the impeller of Fig. VI adapted toa single suctionpump, the casing 23 having a single inlet 24 and the impeller 25 havingshroud plates 26 and 27 mounted thereon.

Our improved pump is very efiicient and relatively little power is reuired to operate the same, it being well balanced and friction beingminimized. At the same time, it is simple and economical in its partsand durable in use. While our improvedpump isespecially designed by usfor use as a vacuum ump, it 1s however desirable for use pure y as allqllld pump as frict on is minlmized.

. Having thus described our invention what we claim as new and desire tosecure by Letters Patent is: p Y

1. In a pump, the combination of a casing provided with inlets at eachside, an impeller provided with blades, and entraining plates mounted insaid casing at the sides of said impeller blades and providing annularair chambers at each side, said entraining plates having a plurality ofslots therein disposed concentrically relative to the axis of theimpeller and arranged in overlapping relation, said slots being ofinwardly tapering cross section.

2. In a pump, the combination of a casing provided with inlets at eachside, an impeller provided with blades, and entn jining lates mounted insaid casing at the ies 0 said impeller blades and providing "inular airchambers at each side, said entraining plates.

provided with blades, and an entraining. plate mounted in said casing atthe side of said impeller blades andproviding an annular air chamber,said entraining plate having a plurality of slots therein disposedconcentrically relative to the axisiof the impeller and arranged inoverlapping relation, said slots being of inwardly tapering crosssection.

5. In a pump, the combination of a casing provided with a suction inlet,an impeller provided with blades, and an entraining plate mounted insaid casing at the side of said impeller blades and providing an annuslar air chamber, said entraining plate having slots therein of section.r 6. In a pump, the combination of a casing, an impeller provided withblades, and a shroud plate mounted in said casing at the side of saidimpellerblades and having slots therein of inwardly tapering crosssection.

inwardly tapering cross In witness whereof wehavehereunto set out hands.

FLOYD r; woons; i a

' EDwiri ML 3'. WEINERQ i

